More Problems

• Write a program to count the number of unique words in a sentence using hashing.
• Create a function that checks if an array is a subset of another using hashing.
• Given a string, write a function to find the longest substring that contains at most two distinct characters using hashing.
• Write a program to find the total number of characters in a string excluding spaces using a hash set.
• Create a function that checks if a string can be rearranged to form a palindrome using hashing.
• Implement a function to count the number of valid email addresses in a list using hashing.
• Write a program to find the first duplicate character in a string using hashing.
• Create a function that checks if a given string is a valid number using a hash map.